<?php

header('Content-Type:text/html;Charset=utf-8');

function GetIp() {
	$realip = '';
	$unknown = 'unknown';
	if (isset($_SERVER)) {
		if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) && !empty($_SERVER['HTTP_X_FORWARDED_FOR']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_FOR'], $unknown)) {
			$arr = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
			foreach ($arr as $ip) {
				$ip = trim($ip);
				if ($ip != 'unknown') {
					$realip = $ip;
					break;
				}
			}
		}else if (isset($_SERVER['HTTP_CLIENT_IP']) && !empty($_SERVER['HTTP_CLIENT_IP']) && strcasecmp($_SERVER['HTTP_CLIENT_IP'], $unknown)) {
			$realip = $_SERVER['HTTP_CLIENT_IP'];
		}else if (isset($_SERVER['REMOTE_ADDR']) && !empty($_SERVER['REMOTE_ADDR']) && strcasecmp($_SERVER['REMOTE_ADDR'], $unknown)) {
			$realip = $_SERVER['REMOTE_ADDR'];
		}else {
			$realip = $unknown;
		}
	}else {
		if (getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), $unknown)) {
			$realip = getenv("HTTP_X_FORWARDED_FOR");
		}else if (getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), $unknown)) {
			$realip = getenv("HTTP_CLIENT_IP");
		}else if (getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), $unknown)) {
			$realip = getenv("REMOTE_ADDR");
		}else {
			$realip = $unknown;
		}
	}
	$realip = preg_match("/[\d\.]{7,15}/", $realip, $matches) ? $matches[0] : $unknown;
	return $realip;
}

function GetIpLookup($ip = '') {
	if (empty($ip)) {
		$ip = GetIp();
	}
	$res = @file_get_contents('http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=js&ip=' . $ip);
	if (empty($res)) {
		return false;
	}
	$jsonMatches = array();
	preg_match('#\{.+?\}#', $res, $jsonMatches);
	if (!isset($jsonMatches[0])) {
		return false;
	}
	$json = json_decode($jsonMatches[0], true);
	if (isset($json['ret']) && $json['ret'] == 1) {
		$json['ip'] = $ip;
		unset($json['ret']);
	}else {
		return false;
	}
	return $json;
}

function get_client_ip() {
	if ($_SERVER['REMOTE_ADDR']) {
		$cip = $_SERVER['REMOTE_ADDR'];
	}elseif (getenv("REMOTE_ADDR")) {
		$cip = getenv("REMOTE_ADDR");
	}elseif (getenv("HTTP_CLIENT_IP")) {
		$cip = getenv("HTTP_CLIENT_IP");
	}else {
		$cip = "unknown";
	}
	return $cip;
}

$a = $_SERVER["REMOTE_ADDR"];
var_dump($_SERVER);

$ipInfos = GetIpLookup('218.2.105.132'); //baidu.com IP地址
var_dump($a, $ipInfos);
